Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Stone Town of Zanzibar' has mentioned 'Trade' in the following places:
Occurrence Sentence Text Source
There is evidence for limited engagement in long-distance trade: a small amount of imported pottery has been found, less than 1% of total pottery finds, mostly from the Gulf and dated to the 5th to 8th century.
Trade rapidly increased in importance and quantity beginning in the mid-8th century and by the close of the 10th century Zanzibar was one of the central Swahili trading towns.
During the period of British protection, the Sultan still retained some power and Stone Town remained a relatively important trading centre for the informal trade.